JVC FS-G5 User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB353
2005/5
COMPACT COMPONENT SYSTEM
MB35320055
FS-G5
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Area suffix
J ---------------------------- U.S.A.
C ------------------------- Canada

1-2 (No.MB353)
SPECIFICATION
Designs and Specifications are subject to change without notice.
Amplifier section Output Power 90 W per channel, min. RMS, driven into 6Ωat 1 kHz with no more than 10% total harmonic
distortion.
Speakers Impedance 6Ω- 16Ω
Audio Input AUX:400 mV/50 kΩ
USB:USB Ver. 1.1
Tuner section FM tuning range 87.5 MHz - 108.0 MHz
AM tuning range 530 kHz - 1 710 kHz
CD player section Dynamic range 85 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
General Power requirement AC 120 V , 60 Hz
Power consumption 125 W (at operation)
21 W (on standby)
0.8 W (with deactivating the clock indication)
Dimensions (approx.) 175 mm ×232 mm ×412 mm (W/H/D)
Mass (approx.) 6.6 kg
Speakers Type 2-way Bass reflex
Speaker units Woofer:10 cm cone ×1
Tweeter:4 cm cone ×1
Impedance 6Ω
Dimensions (approx.) 144 mm ×231 mm ×201 mm (W/H/D)
Mass (approx.) 2.0 kg each

(No.MB353)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

1-4 (No.MB353)
1.5 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.6 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
CD changer mechanism board
CD changer mechanism assembly
Card wire
Short-circuit point

(No.MB353)1-5
1.8 Importance administering point on the safety
Caution: For continued protection against risk of fire,
replace only with same type 2.5 A/250 V for F901.
This symbol specifies the type of fast operating fuse.
Precaution: Pour la protection continue contre les
risques d'incendie, remplacer uniquement par le
meme type: fusible 2.5 A/250 V pour le F901.
Ce symbole specifie le type de fusible a action rapide.
^

1-6 (No.MB353)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB353)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the side panel (R)/ (L)
(See Fig.1 to 3)
(1) Remove the three screws Aattaching the side panel (R) on
the back side and remove the screw Aand Bon the right
side.
(2) Remove the three screws Aattaching the side panel (L) on
the back side and remove the screw Aand Bon the left
side.
(3) Remove the side panel (R) and (L) backward.
Fig.1
Fig.2
Fig.3
AA
Side panel (R) Side panel (L)
A
B
Side panel (R)
A
B
Side panel (L)

1-8 (No.MB353)
3.1.2 Removing the top panel
(See Fig.4 to 7)
• Prior to performing the following procedure, remove the side
panel (R)/(L).
(1) From the back of the body, remove the screw Dattaching
the top panel.
(2) From each side of the body, remove the screw Eattaching
the top panel.
(3) From each side of the body, release the two joints aof the
front panel assembly and top panel.
(4) Move the top panel in the direction of the arrow to release
the two joints band remove the top panel backward.
Fig.4
Fig.5
Fig.6
Fig.7
DTop panel
Rear panel
E
Front panel assembly
Top panel
b
E
Front panel assembly
Top panel b
b
Front panel assembly
Top panel
a

(No.MB353)1-9
3.1.3 Front panel assembly section
3.1.3.1 Removing the front panel assembly
(See Fig.8 to 10)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) From top of the body, disconnect the card wire from con-
nector CN402 on the main board and disconnect the wire
from connector CN671.
(2) From rear left side of the body, disconnect the wire from
connector CN204 on the amplifier board.
(3) Disconnect the earth wire from the top of the CD changer
mechanism cover and from the base chassis on each side
of the body.
(4) From each side of the body, remove the two screws Fat-
taching the front panel assembly.
(5) From the bottom of the body, remove the two screws Gat-
taching the front panel assembly.
(6) Release the two joints dat the lower right and left sides of
the body and remove the front panel assembly forward.
Fig.8
Fig.9
Fig.10
Front panel assembly CN402
Main board
CN671
dFEarth wire
Front panel assembly
CN671
Main board
CN402
d
F
Earth wire
A
mplifier board
CN204
GG
Front panel assembl
y

1-10 (No.MB353)
3.1.3.2 Removing the LCD & function board
(See Fig.11)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Pull out the volume knob on the front side of front panel as-
sembly.
(2) Remove the eight screws Hattaching the LCD & function
board.
Fig.11
3.1.3.3 Removing the AUDIO & AUX board
(See Fig.12)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Jattaching the AUDIO & AUX
board.
3.1.3.4 Removing the PHONE board
(See Fig.12)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Kattaching the PHONE board.
Fig.12
Volume konb
Front panel assembly
LCD & function board
Front panel assembly
HH
JK
AUDIO & AUXBO board PHONE board

(No.MB353)1-11
3.1.4 Removing the main board
(See Fig.13, 14)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) Disconnect the card wire from connector CN401, CN402,
CN661 and CN681 on the main board and disconnect the
wire from connector CN671.
(2) Remove the two screws Mattaching the main board.
(3) Disconnect the connector CN501 and CN601 on the main
board from the amplifier board while moving it in the direc-
tion of the arrow.
Fig.13
Fig.14
CN671
CN401 CN661
Main board
CN402
CN681
Front panel assembly Rear panel
MM
CN601
CN501
Main board
Amplifier board
Rear panel

1-12 (No.MB353)
3.1.5 Removing the tuner pack
(See Fig.15)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) Disconnect the card wire from connector of the tuner pack.
(2) From the back of the body, remove the two screws Nat-
taching the tuner pack.
Fig.15
3.1.6 Removing the transformer board
(See Fig.16)
• Prior to performing the following procedure, remove the side
panel (R)/(L) and the top panel.
(1) From the left side of the body, disconnect the wire from
connector CN102 on the amplifier board.
(2) Disconnect the wire from connector CN901 and CN902 on
the transformer board.
(3) From the left side of the body, remove the two screws Pat-
taching the transformer board.
Fig.16
Connector
Tuner pack
N
Rear panel
Rear panel
CN902
Transformer board
CN901
Amplifier board
CN102
P

(No.MB353)1-13
3.1.7 Removing the fan
(See Fig.17)
• Prior to performing the following procedure, remove the side
panel (R)/(L), the top panel and the transformer board.
(1) From the left side of the body, disconnect the wire from
connector CN105 on the amplifier board.
(2) From the back of the body, remove the four screws Qat-
taching the fan.
Fig.17
Rear panel
Fan
Q
Q
Amplifier board
CN105

1-14 (No.MB353)
3.1.8 Removing the amplifier board/ heat sink
(See Fig.18, 19)
• Prior to performing the following procedure, remove the side
panel (R)/(L), the top panel, the main board, the transformer
board, the tuner pack and the fan.
(1) From top of the body, disconnect the wire from connector
CN101 and CN204 on the amplifier board.
(2) From top of the body, remove the five screws Rattaching
the amplifier board.
(3) From the back of the body, remove the two screws Tat-
taching the amplifier board.
Fig.18
Fig.19
CN101
CN204
Amplifier board
R
R
Rear panel
Rear panel
Amplifier board
T

(No.MB353)1-15
3.1.9 Removing the power transformer assembly/ power cord
(See Fig.20 to 24)
• Prior to performing the following procedure, remove the side
panel (R)/(L), the top panel, the main board, the transformer
board, the fan and the amplifier board.
Reference:
You do not need remove the tuner pack which is attached to
the rear panel.
(1) From the back of the body, remove the three screws Uat-
taching the rear panel and the rear cover to the base chas-
sis.
(2) Release the two joints eat the lower right and left sides of
the body. The rear panel comes off together with the rear
cover.
(3) From top of the body, remove the four screws Yattaching
the power transformer assembly.
(4) If you disconnect the power cord, pull the power cord stop-
per attaching the power cord in the direction of the arrow as
shown in Fig.24 and remove it from the base chassis.
Fig.20
Fig.21
Fig.22
Fig.23
Fig.24
U
Rear panel
Rear cover
Rear panel Rear cover
d
Rear panel
Rear cover
d
Power cord stopper
Power cord stoppe
r
Power cord
Power transformer assembly Y
Y
Base chassis
Base chassis
Power cord stopper
Power cord

1-16 (No.MB353)
3.1.10 CD changer mechanism assembly section
3.1.10.1 Removing the CD changer mechanism assembly
(See Fig.25 to 30)
• Prior to performing the following procedure, remove the side
panel (R)/(L), the top panel, the main board, the transformer
board, the fan, the amplifier board and the rear panel.
(1) From both side of the body, remove the four screws A' at-
taching the CD changer mechanism cover and detach it in
the direction of the arrow.
Reference:
To reattach the CD changer mechanism cover, fit the
four point fof the CD changer mechanism cover to the
four point gof the base chassis as shown in Fig.27.
(2) From the front side of the body, remove the two screws B'
attaching the CD changer mechanism assembly.
(3) From the back of the body, remove the two screws D' at-
taching the CD changer mechanism assembly.
(4) Remove the CD changer mechanism assembly in the di-
rection of the arrow while pulling the front and rear brackets
outward. Fig.25
Fig.26
CD changer mechanism assembly
CD changer mechanism cove
r
Base chassis A' A'
Point f , gPoint f , g
CD changer mechanism assembly
CD changer mechanism cover
Base chassis
A' A'
Point f , g Point f , g

(No.MB353)1-17
Fig.27
Fig.28
Fig.29
Fig.30
Point g
Point f
Point f
Point g
CD changer machanism cover
Base chassis
CD changer mechanism assembly
Bracket B' B'
CD changer mechanism assembly
Bracket
D' D'
Bracket
Bracket
CD changer mechanism assembly

1-18 (No.MB353)
3.1.10.2 Removing the CD changer mechanism board
(See Fig.31 to 33)
• Prior to performing the following procedure, remove the CD
changer mechanism assembly.
Caution:
Make sure to solder the short-circuit point on the CD pickup
board before disconnecting the card wire connected to con-
nector CN701 on the CD changer mechanism board and the
CD pickup board. If you do not follow this instruction, the pick-
up may be damaged.
(1) From the bottom of the CD changer mechanism assembly,
disconnect the wire from connector CN872 and CN873 on
the CD changer mechanism board.
(2) From the left side of the CD changer mechanism assembly,
disconnect the wire from connector on the CD motor
board.
(3) Remove the four screws E' attaching the CD changer
mechanism board.
(4) Move the CD changer mechanism board as shown in
Fig.32 and solder the short-circuit point on the CD pickup
board.
(5) Disconnect the card wire from connector CN701 on the CD
changer mechanism board.
Caution:
To reattach the CD changer mechanism board, connect the
card wire to connector CN701 on the CD mechanism board
and the CD pickup board before unsoldering the short-circuit
point.
Fig.31
Fig.32
Fig.33
CN871
CN872
CN701
CN873
CD motor board
CD changer mechanism board
CD changer mechanism assembly
E'
E'E'
CD changer mechanism board
CD changer mechanism assembly
Card wire
Short-circuit point
CN701
CD pickup board
Card wire
Sold
Short-circuit point

(No.MB353)1-19
3.1.10.3 Removing the CD changer mechanism
(See Fig.34, 35)
• Prior to performing the following procedure, remove the CD
changer mechanism assembly and CD changer mechanism
board.
(1) Remove the three screws F' attaching the CD changer
mechanism holder. The CD changer mechanism comes
off, too.
(2) Remove the four screws G' attaching the CD changer
mechanism.
Fig.34
Fig.35
CD changer mechanism assembly
CD changer mechanism
CD changer mechanism holder
F'
F'
F'
CD changer mechanism
CD changer mechanism holder
G'
G'
G' G'

1-20 (No.MB353)
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.